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The official Couchbase JVM Core IO Library
/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package com.couchbase.client.deps.io.netty.buffer;
import com.couchbase.client.deps.io.netty.util.Recycler;
import com.couchbase.client.deps.io.netty.util.internal.PlatformDependent;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.GatheringByteChannel;
import java.nio.channels.ScatteringByteChannel;
final class PooledUnsafeDirectByteBuf extends PooledByteBuf {
private static final boolean NATIVE_ORDER = ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN;
private static final Recycler RECYCLER = new Recycler() {
@Override
protected PooledUnsafeDirectByteBuf newObject(Handle handle) {
return new PooledUnsafeDirectByteBuf(handle, 0);
}
};
static PooledUnsafeDirectByteBuf newInstance(int maxCapacity) {
PooledUnsafeDirectByteBuf buf = RECYCLER.get();
buf.setRefCnt(1);
buf.maxCapacity(maxCapacity);
return buf;
}
private long memoryAddress;
private PooledUnsafeDirectByteBuf(Recycler.Handle recyclerHandle, int maxCapacity) {
super(recyclerHandle, maxCapacity);
}
@Override
void init(PoolChunk chunk, long handle, int offset, int length, int maxLength) {
super.init(chunk, handle, offset, length, maxLength);
initMemoryAddress();
}
@Override
void initUnpooled(PoolChunk chunk, int length) {
super.initUnpooled(chunk, length);
initMemoryAddress();
}
private void initMemoryAddress() {
memoryAddress = PlatformDependent.directBufferAddress(memory) + offset;
}
@Override
protected ByteBuffer newInternalNioBuffer(ByteBuffer memory) {
return memory.duplicate();
}
@Override
public boolean isDirect() {
return true;
}
@Override
protected byte _getByte(int index) {
return PlatformDependent.getByte(addr(index));
}
@Override
protected short _getShort(int index) {
short v = PlatformDependent.getShort(addr(index));
return NATIVE_ORDER? v : Short.reverseBytes(v);
}
@Override
protected int _getUnsignedMedium(int index) {
long addr = addr(index);
return (PlatformDependent.getByte(addr) & 0xff) << 16 |
(PlatformDependent.getByte(addr + 1) & 0xff) << 8 |
PlatformDependent.getByte(addr + 2) & 0xff;
}
@Override
protected int _getInt(int index) {
int v = PlatformDependent.getInt(addr(index));
return NATIVE_ORDER? v : Integer.reverseBytes(v);
}
@Override
protected long _getLong(int index) {
long v = PlatformDependent.getLong(addr(index));
return NATIVE_ORDER? v : Long.reverseBytes(v);
}
@Override
public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
checkIndex(index, length);
if (dst == null) {
throw new NullPointerException("dst");
}
if (dstIndex < 0 || dstIndex > dst.capacity() - length) {
throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
}
if (length != 0) {
if (dst.hasMemoryAddress()) {
PlatformDependent.copyMemory(addr(index), dst.memoryAddress() + dstIndex, length);
} else if (dst.hasArray()) {
PlatformDependent.copyMemory(addr(index), dst.array(), dst.arrayOffset() + dstIndex, length);
} else {
dst.setBytes(dstIndex, this, index, length);
}
}
return this;
}
@Override
public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
checkIndex(index, length);
if (dst == null) {
throw new NullPointerException("dst");
}
if (dstIndex < 0 || dstIndex > dst.length - length) {
throw new IndexOutOfBoundsException("dstIndex: " + dstIndex);
}
if (length != 0) {
PlatformDependent.copyMemory(addr(index), dst, dstIndex, length);
}
return this;
}
@Override
public ByteBuf getBytes(int index, ByteBuffer dst) {
getBytes(index, dst, false);
return this;
}
private void getBytes(int index, ByteBuffer dst, boolean internal) {
checkIndex(index);
int bytesToCopy = Math.min(capacity() - index, dst.remaining());
ByteBuffer tmpBuf;
if (internal) {
tmpBuf = internalNioBuffer();
} else {
tmpBuf = memory.duplicate();
}
index = idx(index);
tmpBuf.clear().position(index).limit(index + bytesToCopy);
dst.put(tmpBuf);
}
@Override
public ByteBuf readBytes(ByteBuffer dst) {
int length = dst.remaining();
checkReadableBytes(length);
getBytes(readerIndex, dst, true);
readerIndex += length;
return this;
}
@Override
public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
checkIndex(index, length);
if (length != 0) {
byte[] tmp = new byte[length];
PlatformDependent.copyMemory(addr(index), tmp, 0, length);
out.write(tmp);
}
return this;
}
@Override
public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
return getBytes(index, out, length, false);
}
private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
checkIndex(index, length);
if (length == 0) {
return 0;
}
ByteBuffer tmpBuf;
if (internal) {
tmpBuf = internalNioBuffer();
} else {
tmpBuf = memory.duplicate();
}
index = idx(index);
tmpBuf.clear().position(index).limit(index + length);
return out.write(tmpBuf);
}
@Override
public int readBytes(GatheringByteChannel out, int length)
throws IOException {
checkReadableBytes(length);
int readBytes = getBytes(readerIndex, out, length, true);
readerIndex += readBytes;
return readBytes;
}
@Override
protected void _setByte(int index, int value) {
PlatformDependent.putByte(addr(index), (byte) value);
}
@Override
protected void _setShort(int index, int value) {
PlatformDependent.putShort(addr(index), NATIVE_ORDER ? (short) value : Short.reverseBytes((short) value));
}
@Override
protected void _setMedium(int index, int value) {
long addr = addr(index);
PlatformDependent.putByte(addr, (byte) (value >>> 16));
PlatformDependent.putByte(addr + 1, (byte) (value >>> 8));
PlatformDependent.putByte(addr + 2, (byte) value);
}
@Override
protected void _setInt(int index, int value) {
PlatformDependent.putInt(addr(index), NATIVE_ORDER ? value : Integer.reverseBytes(value));
}
@Override
protected void _setLong(int index, long value) {
PlatformDependent.putLong(addr(index), NATIVE_ORDER ? value : Long.reverseBytes(value));
}
@Override
public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
checkIndex(index, length);
if (src == null) {
throw new NullPointerException("src");
}
if (srcIndex < 0 || srcIndex > src.capacity() - length) {
throw new IndexOutOfBoundsException("srcIndex: " + srcIndex);
}
if (length != 0) {
if (src.hasMemoryAddress()) {
PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, addr(index), length);
} else if (src.hasArray()) {
PlatformDependent.copyMemory(src.array(), src.arrayOffset() + srcIndex, addr(index), length);
} else {
src.getBytes(srcIndex, this, index, length);
}
}
return this;
}
@Override
public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
checkIndex(index, length);
if (length != 0) {
PlatformDependent.copyMemory(src, srcIndex, addr(index), length);
}
return this;
}
@Override
public ByteBuf setBytes(int index, ByteBuffer src) {
checkIndex(index, src.remaining());
ByteBuffer tmpBuf = internalNioBuffer();
if (src == tmpBuf) {
src = src.duplicate();
}
index = idx(index);
tmpBuf.clear().position(index).limit(index + src.remaining());
tmpBuf.put(src);
return this;
}
@Override
public int setBytes(int index, InputStream in, int length) throws IOException {
checkIndex(index, length);
byte[] tmp = new byte[length];
int readBytes = in.read(tmp);
if (readBytes > 0) {
PlatformDependent.copyMemory(tmp, 0, addr(index), readBytes);
}
return readBytes;
}
@Override
public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
checkIndex(index, length);
ByteBuffer tmpBuf = internalNioBuffer();
index = idx(index);
tmpBuf.clear().position(index).limit(index + length);
try {
return in.read(tmpBuf);
} catch (ClosedChannelException ignored) {
return -1;
}
}
@Override
public ByteBuf copy(int index, int length) {
checkIndex(index, length);
ByteBuf copy = alloc().directBuffer(length, maxCapacity());
if (length != 0) {
if (copy.hasMemoryAddress()) {
PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
copy.setIndex(0, length);
} else {
copy.writeBytes(this, index, length);
}
}
return copy;
}
@Override
public int nioBufferCount() {
return 1;
}
@Override
public ByteBuffer[] nioBuffers(int index, int length) {
return new ByteBuffer[] { nioBuffer(index, length) };
}
@Override
public ByteBuffer nioBuffer(int index, int length) {
checkIndex(index, length);
index = idx(index);
return ((ByteBuffer) memory.duplicate().position(index).limit(index + length)).slice();
}
@Override
public ByteBuffer internalNioBuffer(int index, int length) {
checkIndex(index, length);
index = idx(index);
return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
}
@Override
public boolean hasArray() {
return false;
}
@Override
public byte[] array() {
throw new UnsupportedOperationException("direct buffer");
}
@Override
public int arrayOffset() {
throw new UnsupportedOperationException("direct buffer");
}
@Override
public boolean hasMemoryAddress() {
return true;
}
@Override
public long memoryAddress() {
ensureAccessible();
return memoryAddress;
}
private long addr(int index) {
return memoryAddress + index;
}
@Override
protected Recycler recycler() {
return RECYCLER;
}
@Override
protected SwappedByteBuf newSwappedByteBuf() {
return new UnsafeDirectSwappedByteBuf(this);
}
}